Malware Analysis Report

2024-11-15 06:41

Sample ID 240603-kjf5asae94
Target 2024-06-03_f262fcd17104f903e343fe739502f0d6_bkransomware
SHA256 620d13c4a73f2fef68c67391ab2cfa00dbe4443a673352df13cb265c2f00d5e1
Tags
persistence spyware stealer
score
7/10

Table of Contents

Analysis Overview

MITRE ATT&CK

Enterprise Matrix V15

Analysis: static1

Detonation Overview

Signatures

Analysis: behavioral1

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis: behavioral2

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis Overview

score
7/10

SHA256

620d13c4a73f2fef68c67391ab2cfa00dbe4443a673352df13cb265c2f00d5e1

Threat Level: Shows suspicious behavior

The file 2024-06-03_f262fcd17104f903e343fe739502f0d6_bkransomware was found to be: Shows suspicious behavior.

Malicious Activity Summary

persistence spyware stealer

Executes dropped EXE

Reads user/profile data of web browsers

Adds Run key to start application

Drops file in Windows directory

Unsigned PE

Suspicious use of AdjustPrivilegeToken

Suspicious use of WriteProcessMemory

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2024-06-03 08:37

Signatures

Unsigned PE

Description Indicator Process Target
N/A N/A N/A N/A

Analysis: behavioral1

Detonation Overview

Submitted

2024-06-03 08:37

Reported

2024-06-03 08:40

Platform

win7-20240508-en

Max time kernel

121s

Max time network

121s

Command Line

"C:\Users\Admin\AppData\Local\Temp\2024-06-03_f262fcd17104f903e343fe739502f0d6_bkransomware.exe"

Signatures

Executes dropped EXE

Description Indicator Process Target
N/A N/A C:\Windows\CTS.exe N/A

Reads user/profile data of web browsers

spyware stealer

Adds Run key to start application

persistence
Description Indicator Process Target
Set value (str) \REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Run\CTS = "C:\\Windows\\CTS.exe" C:\Windows\CTS.exe N/A
Set value (str) \REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Run\CTS = "C:\\Windows\\CTS.exe" C:\Users\Admin\AppData\Local\Temp\2024-06-03_f262fcd17104f903e343fe739502f0d6_bkransomware.exe N/A

Drops file in Windows directory

Description Indicator Process Target
File created C:\Windows\CTS.exe C:\Users\Admin\AppData\Local\Temp\2024-06-03_f262fcd17104f903e343fe739502f0d6_bkransomware.exe N/A
File created C:\Windows\CTS.exe C:\Windows\CTS.exe N/A

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Local\Temp\2024-06-03_f262fcd17104f903e343fe739502f0d6_bkransomware.exe N/A
Token: SeDebugPrivilege N/A C:\Windows\CTS.exe N/A

Processes

C:\Users\Admin\AppData\Local\Temp\2024-06-03_f262fcd17104f903e343fe739502f0d6_bkransomware.exe

"C:\Users\Admin\AppData\Local\Temp\2024-06-03_f262fcd17104f903e343fe739502f0d6_bkransomware.exe"

C:\Windows\CTS.exe

"C:\Windows\CTS.exe"

Network

N/A

Files

C:\Windows\CTS.exe

MD5 f9d4ab0a726adc9b5e4b7d7b724912f1
SHA1 3d42ca2098475924f70ee4a831c4f003b4682328
SHA256 b43be87e8586ca5e995979883468f3b3d9dc5212fbfd0b5f3341a5b7c56e0fbc
SHA512 22a5f0e4b2716244e978ee50771823926f86baf0382ece48fd049f039cf77b5eb0691d83c61148903cff081fdbea969f47b8ed521647717f42bbed5c64552432

C:\Users\Admin\AppData\Local\Temp\JngAhQQLVWkffW7.exe

MD5 855f411fb454a585b04aadd1cdb5bdef
SHA1 867a24728a654eaffd3c8faf4ebb1f8e1db62b7f
SHA256 5edf2c5889fe3c968d6e1541221b34334495419b898677ab712ce2ee19184d2a
SHA512 28a0289d3e2f0921a43b14447098f30ddbb6d5f255e25ae71fcd5438adeb219021a627ec4e2d70a853baab22b2781ba9bfca941a2833f8c008a5e490cbd874fd

Analysis: behavioral2

Detonation Overview

Submitted

2024-06-03 08:37

Reported

2024-06-03 08:40

Platform

win10v2004-20240426-en

Max time kernel

94s

Max time network

147s

Command Line

"C:\Users\Admin\AppData\Local\Temp\2024-06-03_f262fcd17104f903e343fe739502f0d6_bkransomware.exe"

Signatures

Executes dropped EXE

Description Indicator Process Target
N/A N/A C:\Windows\CTS.exe N/A

Reads user/profile data of web browsers

spyware stealer

Adds Run key to start application

persistence
Description Indicator Process Target
Set value (str) \REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\CTS = "C:\\Windows\\CTS.exe" C:\Users\Admin\AppData\Local\Temp\2024-06-03_f262fcd17104f903e343fe739502f0d6_bkransomware.exe N/A
Set value (str) \REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\CTS = "C:\\Windows\\CTS.exe" C:\Windows\CTS.exe N/A

Drops file in Windows directory

Description Indicator Process Target
File created C:\Windows\CTS.exe C:\Users\Admin\AppData\Local\Temp\2024-06-03_f262fcd17104f903e343fe739502f0d6_bkransomware.exe N/A
File created C:\Windows\CTS.exe C:\Windows\CTS.exe N/A

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Local\Temp\2024-06-03_f262fcd17104f903e343fe739502f0d6_bkransomware.exe N/A
Token: SeDebugPrivilege N/A C:\Windows\CTS.exe N/A

Processes

C:\Users\Admin\AppData\Local\Temp\2024-06-03_f262fcd17104f903e343fe739502f0d6_bkransomware.exe

"C:\Users\Admin\AppData\Local\Temp\2024-06-03_f262fcd17104f903e343fe739502f0d6_bkransomware.exe"

C:\Windows\CTS.exe

"C:\Windows\CTS.exe"

Network

Country Destination Domain Proto
US 8.8.8.8:53 154.239.44.20.in-addr.arpa udp
US 8.8.8.8:53 95.221.229.192.in-addr.arpa udp
US 8.8.8.8:53 20.160.190.20.in-addr.arpa udp
US 8.8.8.8:53 196.249.167.52.in-addr.arpa udp
US 8.8.8.8:53 86.23.85.13.in-addr.arpa udp
US 8.8.8.8:53 198.187.3.20.in-addr.arpa udp
US 8.8.8.8:53 30.243.111.52.in-addr.arpa udp

Files

C:\Windows\CTS.exe

MD5 f9d4ab0a726adc9b5e4b7d7b724912f1
SHA1 3d42ca2098475924f70ee4a831c4f003b4682328
SHA256 b43be87e8586ca5e995979883468f3b3d9dc5212fbfd0b5f3341a5b7c56e0fbc
SHA512 22a5f0e4b2716244e978ee50771823926f86baf0382ece48fd049f039cf77b5eb0691d83c61148903cff081fdbea969f47b8ed521647717f42bbed5c64552432

C:\Users\Admin\AppData\Local\Microsoft\Office\16.0\excel.exe_Rules.xml

MD5 870724f2d942b3676711b5bd44aeca60
SHA1 d9e6559ef4dd088a376da7cca69c604643e53308
SHA256 acb3ae71473c1cf5a54701dbc4eb8ea9ed8851a9321523689ab40936f64eef3d
SHA512 2fe0442f9a57a6116a7768614ab0b6984dfe667fbf36c900598176c1036862e83688fd43a82a9ae2d7f9f19599e31620d5cdf00845781740938cb587439a8114

C:\Users\Admin\AppData\Local\Temp\1rhFcMJBx9d0lGP.exe

MD5 6517c0b003e7bffc76f5588efb9db530
SHA1 3a3114c52ff675cd0b92fc86f58775aeb0e08880
SHA256 f1f5aec3383abd1e388e556d73ad5fc801b829cf7412d262fdf2664960760370
SHA512 e1c3977a3e628a9ab2f51637c082eda629342c02d36ab40481ed95ba7aef9ac729ce248cc18c9b1fe5de49170771a4fbfffd3aa40f4790293114300a4e79f527